Reversible Temperature-Stimulated Single-Crystal-to-Single-Crystal Conformational Polymorph Transformation in Cadmium(II) Coordination Trimer with a Water Vapor Sorption/Desorption Potential

A crystalline cadmium(II) coordination trimer with pyridine-4-propanamide (4-propy), [Cd3Cl4(H2O)4(4-propy)6](CH3CH2COO)2, readily responds to external stimuli while preserving crystal integrity. Two polymorphic forms, Polymorph-I (triclinic form) and Polymorph-II (monoclinic form), undergo a reversible single-crystal-to-single-crystal conformational polymorph transformation upon temperature change, while the triclinic form (Polymorph-I)...